Hammer drill



June 24,1930.

HAMMER DRILL Original Filed Jan. 16,, 1928 PAR/5 Z. 5/) V462 P; L. SAVAGEET L 1,7 8,216

INVENTOR.

v11 /11 MM IPA 01955 Patented June 24, 1930 UNlTED S -m PIT PARIS nsAvAGE, or BISBEE, ARIZONA, AND wrLLmM snort-s, or s mester,-

CALIFORNIA; SAID RHODES ASSIGNOR TQ JOHN vannrn, or BISBEE, nnzz'onn I HAMMER DRILL Originalapplicati on filedJ'anuary 16,

This invention appertains to hammer drills and is a division of our application filed January 16, 1928, Serial No. 247,124.

The primary object of the present invention is to. provide an improved means for 'head for hammer drills with novel means for detachably connecting said sections together the construction of the head permitting the use of and the quick changing of relatively long steels or bits; 7 I

With these and other objects in view, the invention consists in the novel construction, arrangement-and formation of parts,

as will be hereinafter more specifically de-' scribed, claimed and illustrated in the accompanying drawing, in which drawing Figure 1 is a fragmentary top planview of the front head of a hammer drill, showing the novel construction of said head,

Figure 2 is a longitudinal section through the same taken on the line 22 of Figure 1, looking in the direction of the arrows,

Figure 3 is a transverse section taken on the line 3-3 of Figure 1, looking in the direction of the arrows, v

Figure 4 isa fragmentary front end elevation of the hammer drill showing one of the dust lugs carried by the removable sec- .tion of said head for covering the tongue and groove connection between thsections of the head, and

Figure 5 is a fragmentary detail section through the front of the head showing one of the dust lugs. Y

R- ferring to the drawing in detail, wherein similar reference characters designate corresponding parts throughout the severalthe front head 13 and they cylinder 11 is the 1928, Serial No. 247,124. Divided and this 22,1828. Serial No. 328,022.

application filed December cylinder bushing ll. These parts are'held in place by the front head bolts which are extended through suitable ears l6 and 17 formed respectively on the head'and cylinder. The forward ends of the front head bolts receive nuts 18 and expansion springsz19 are confined between the nuts and the ears 16.

The front head construction forms the important feature of the present invention and will now be described. This head 13 supports the drill steel or bit 20 and the head is so constructed as to permit the operator of themachinc to change a drill steel six inches longer than the old style front iead, which is very important and which saves time and labor in, the changing of bits or drill steels. r I, I

This head 13 includes a removable semi. cylindrical p rtion at the extreme front end thereof and forms a companion portion for the rigid semi-cylindrical portion 26, which is an integral part oft-he body por-- tion 27 of said front head. In order to hold the removable portion 25 in place, we provide a T-shaped tongue and groove con nection 28 and 29 between the companion portions 25 and 26 as clearly shown Figure 3 of the drawing. The tongueand the walls of the groove can be provided with a slight taper, if so preferred, which will eliminate lateral movement of thedetachable section. V j J, I In order to prevent the entrance of for eign matter into the front head between the tongues and grooves, lugs 30 are moulded on the removable semi-cylindrical section 25' of the front head, which extends over the grooves of the rigid semi-cylindrical section 26. hen the removable section is in assembled position, :the inner end thereof abuts against the body portion 27 of the front head, while the lugs 30 abut against thesemi-cylindrical rigid section'26 and cover the ends of the grooves 29. A latch 31 is provided, as shown in Figure 2 of the drawings,rfor preventing the accidental displacement ofthe removable section 25. This latch, as shown, includes a resilient latch bar or dog 32 which is riveted or otherwise secured to the body portion 27 of the front head. This resilient latch bar or dog 32 projects forwardly from said body portion and is provided with a tooth 33 at its extreme forward end. .The detachable section 25 is provided with a' keeper 34 and when said section is slid into operative position the latch or dog 32 will slide into'the keeper, and the tooth 33 thereof will en gage the keeper and hold the section in position; The latch bar or dog 32 can be readily actuated by the thumb of the operator, as itis merely necessary to press this latch or dog untilthe tooth thereof rides out of engagement with the front of the keeper after which the removablesection can be pulled forwardly. 1

A short piece of chain 35 is attached to the removable'section 25 and to one of the front head bolts 15, so as to prevent loss of the removable section.

It is obvious fromthe foregoing that a fronthead has'been provided which will permit the useof longer drill steels with the apparatus and which will permit the convenient 'changingof said drill steels. I

7 Changes in details may be made'without departing from-the spirit or the scope'of this invention.

What we claim as new is:

1.'A front head for hammer drills comprising a'body, a semi-cylindrical extension on said body, a companion semi-cylindrical extension each having a portion of a guideway'therein' for a drill' bit, a tongue and groove connectlon between sald extensions latch plates for normally covering the tongue and" groove connection at the outer end of thehead, and a latch for engaging the removable section carried bysaid body.

2. A front head for hammer drills for receiving a drill'bit, comprising. a body having an opening'ther'ein, for said drillbit, a

semi-cylindrical extension on 'said body having a portion of a guide-way therein for the drill. bit, a companion semi-cylindrical extension removably associated with the rigid extension having 'a companion guideway portion for the drill bit, said removable extension being adapted to abut thebody when in operative position, means for preventing'l'ateral shifting movement of the removable extension relative to the rigid extension, and means for normally preventing forward shifting movement of the removable extension relative to the rigid extension. I

In testimony whereof we affix our signatu res. I

PARIS L. SAVAGE. WILLIAM RHODES. 

